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(#) Multiple Versions Gradle Dependency

!!! Tip: Multiple Versions Gradle Dependency
   Advice from this check is just a hint; it's "weak" warning.

Id
:   `SimilarGradleDependency`
Summary
:   Multiple Versions Gradle Dependency
Severity
:   Hint
Category
:   Correctness
Platform
:   Any
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   8.5.0 (June 2024)
Affects
:   Gradle build files and TOML files
Editing
:   This check runs on the fly in the IDE editor
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/GradleDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/GradleDetectorTest.kt)

This detector looks for usages of libraries when name and group are the
same but versions are different. Using multiple versions in big project
is fine, and there are cases where you deliberately want to stick with
such approach. However, you may simply not be aware that this situation
happens, and that is what this lint check helps find.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
../gradle/libs.versions.toml:6:Hint: There are multiple dependencies
joda-time:joda-time but with different version
[SimilarGradleDependency]
joda_library = { module = "joda-time:joda-time", version.ref = "jodaVersion"}
                -------------------------------------------------------------
../gradle/libs.versions.toml:7:Hint: There are multiple dependencies
joda-time:joda-time but with different version
[SimilarGradleDependency]
joda_library2 = { module = "joda-time:joda-time", version = "2.0"}
                 -------------------------------------------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`../gradle/libs.versions.toml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~toml linenumbers
[versions]
jodaVersion = "2.1"
dagger="1.2.0"

[libraries]
joda_library = { module = "joda-time:joda-time", version.ref = "jodaVersion"}
joda_library2 = { module = "joda-time:joda-time", version = "2.0"}
dagger-lib = { group = "com.squareup.dagger", name ="dagger", version.ref = "dagger" }
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/GradleDetectorTest.kt)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `GradleDetector.testVersionCatalogWithSimilarLibraryDependencies`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Using a suppression comment like this on the line above:

  ```kt
  //noinspection SimilarGradleDependency
  problematicStatement()
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="SimilarGradleDependency" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'SimilarGradleDependency'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore SimilarGradleDependency ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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